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2012/12/10

1020 Fed Cricket 3 pellets.
1035 Filled LN2 cold trap.
1050 Warmed up leak checker. Sealed off IVC. Opened leak checker to line leading up to IVC. Background leak rate in hose is 6.3E-10 mbar l/s.
1052 Leak rate in IVC is 3.4E-7 mbar l/s.
Pump out IVC again.
1502 Mixing chamber temperature 7.8 K. Background leak rate: 6.6E-10 mbar l/s.
1503 IVC leak rate: 2.4E-7 mbar l/s.
1710 Mixing chamber temperature 10 K. Background leak rate: 6.5E-10 mbar l/s.
IVC leak rate: 1.4E-6 mbar l/s.
1820 Fed Cricket 4 pellets.
2020 Mixing chamber temperature 15 K. Background helium leak rate 6.4E-10 mbar l/s. IVC leak rate 2.7E-6 mbar l/s.
2040 Mixing chamber heater power at 20 mW, mixing chamber temperature rising rather slowly. Open up IVC and start evacuating it with turbo pump. Will observe temperature rise over the next hour to determine if fridge can be left in this state overnight.
2200 Mixing chamber temperature 16.6 K. Rate of temperature increase has slowed. Looks like it is safe to leave overnight.